322 STATES OF INSECTS. 



on the whole, and alternately one long and one short; but 

 in some, as Saturnia Pavonia, there is only one short 

 branch or tooth on each joint in this sex a . In Bombyx re- 

 galls &c. only the first part of the antenna is so branched ; 

 and those of the female are setaceous and without branches. 

 In B. versicolor, &c. there is only one branch from each 

 side on every joint ; those of the female being much 

 shorter than those of the male. The latter sex of Ptero- 

 nus Laricls Jur., a saw-fly, afford an example of a dif- 

 ferent structure, the antennae on one side sending forth 

 a branch from every joint but the two first; but on the 

 other side, the nine or ten last joints also are without a 

 branch. The female antenna is serrated b . In another 

 of this tribe, Pterygopterus clnctus Klug, the male an- 

 tenna resembles a single-toothed comb, being branched 

 only on one side : that of the female, like the former in- 

 stance, is serrated c . Whether the remarkable antennae 

 that distinguish the known individuals of the genus Phen- 

 godes [Lampyrls plumosa F.) is a sexual character has 

 not been ascertained ; but it is not improbable that it 

 may be, as in other Lampyrldce. A pair of delicate 

 flexile and almost convolute plumose branches proceeds 

 from the apex of each joint except the basal ones, which 

 have something the air of cirri, and give a more than 

 usual degree of lightness and elegance to these organs d . 

 Other antenna?, especially in the Dlptera order, assume 

 an appearance of plumes — not from the branches that pro- 

 ceed from them, but from the fine long hairs that beset 

 and adorn them. These are universally indications of the 



a De Geer i. t. xix / 11, 12. '> Jurine Hymenopt. t. vi./. 8. 

 c Plate XXV. Fig. 25,26. ll Ibid. Fig. 4. 



